Field joint mold



Feb. 9, 1954 Filed Feb. 25, 1953 G. P. KILLIAN ET AL FIELD JOINT MOLD 2 Sheets-Sheet l INVENTORS wzye KKi/la'mn/ d efmwesi Fi ian BY m h ATToRwg s 1954 G. P. KILLIAN El AL 2,668,344

FIELD JOINT MOLD Filed Feb. 25, 1953 2 Sheets-Sheet 2 fo -/6 45 4g IN VE N TORS fieaye I? w 'Jmawl, 151mm ATTORNEYS Patented eb. 9, 1954 UN 5 TATE-S PAT E N Q'F F 2,668,314

:FIEDD- iIOINT GeorgePJKillian, Kl'exandila, Va.,'ahii'ITafiies KilianfBothwda, Md.

iApplicationiEebruary 25, 1953, Serial No. 338,838

scams. 1 fillhe present .inventionirelates ;in general to molds for application of corrosion-resistantcoat- .ing materialsto ;pi pe joints, .-fiel-d :couplings and the like, and more particularly to :molding :boots I of sheet material such as :cardboard or the (like,

:to -=be assembled about field joint couplings-of xgas main sections to facilitate molding iof cormosioneresistant coatings about the .field Joint.

IIhe present invention is particularly designed ior .-use .-in connection with. pipe-lines or mains .v'for distributing c'ity gas, and will he described in rconnection with this specific application. It is \to be understood, however, that the invention-is readily adaptableior use inconnection with i-pipe conduit systems generally, suehias :for forming lead coated joints in plumbing systems and the like.

One hi the greatest problems arising incon- .-neotion with maintenance of pipe and conduit systemsfor city gas is that of corrosion control hr mitigation. Pipe-lines and pipe systems for conveying gaseous fuel require special cou ling procedures in constructing the field joints-intercoupling the various pipe sections of the system,

to prevent the escape of gas from the field'joints.

Since such gas pipe-lines are usually laid in the soil, and exposed metallic pipe surfaces are there- .iore ,particulaiily subject to corrosion on contact with the soil, special measures must be taken to prevent corrosion.

It is preferable in constructing such gas pipelines to employ steel pipe. Steel pipe, however, intensifies the corrosion problem since contact of certain soils with the surface of the steel pipes sets up galvanic action which releases-steel ions from the pipe. This release of steel ions is exhibited as corrosion. In order to avoid the corrosion efiect of soil on the steel pipe. the pipe must be coated continuously throughout its length to insulate the steel surface from contact with the soil. Steel pipe sections to be employed in such pipe-lines are now supplied by commercial sources with a layer of coating material preformed thereon and extending continuously along the pipe section to a point spaced slightly from each end of the pipe section. These coatings are usually formed. of hot coating enamel made out of pitch, asphalt or other bituminous products When. such commercially available steel'pipe sections areassembled to form apipe-line, the coupling elements between the respective pipe sections and. the area of the pipe immediately adiacentthefieldioint arein an uncoated state, and therefore. be completely coated with corrosionsresistant material after the pipe sec- 2 =tions have been intercouplei. I-t has 'bee 'n the con-ventional :practice heretofore to completely envelop the coupling joint with such a corrosionresistant coating by wrapping sheet material about the coupling elements and joint with the endsef the sheet material extending beyond the ends of the :pr-e-icrmed coating on the commerciallysupplieq pipe sections to =define an enclosureinto which molten material niay be -Do1i'red about the joint. The sheet material forming the wrapping is bound at -each end to the surface of the :joined apipe sections, and openings are left in an upwarolly iacingportion of thewiappin'g through which the molten coating material be poured. This methol requires a considerable v amount of skilled labor beca-use or the precision 'u't does "not usually insure adequateprotectfin "o" the downwardlyfacing portions-of the pipe since it is extremely difficult to prevent 'thepipe'ain'tl coupling elements "from sagging against the loiter portions of the wrapping and thereby preventing the under-portions of the ijoiht item being properly coated. A x

object -of the present invention, therefore, is the provision of -a novel mold unit for applying corrosion-resistant materials to pipe joints and the like which -is formed of merpehsive materials, which maybe shipped aha stored in 'flat hondition, and. which obviates theuisadvajhtages incident to the above described method of costing wpipe -joints. I

Another object of the [present invention fs the provision of a novel mold unit to be applied "to field pipe joints *and couplings in gas conduit systems, which is adapted to receive "and mold corrosion-resistant coatings continuously over the uncoated areas of the pipe joints and sonp s Another object of the present invention is the provision of a mold boot for coating pip'e joints and couplings in gas conduit system's v'r'i'th a molten corrosion resistant material, which ffiol'd boot may be readily assembled without the "use of skilled labor. 7 I

Another object of the present invention the provision of a novel molding boot for farming corrosion-resistant coatings about pipe joints in gas conduit systems, which may be readily assembled from sections of sheet material such as cardboard or the like, anziwhich when assembled insure thatproper thicknesses of coating material will be formed about the pipe joint. Other objects, advantages and caps. il'ities s: the present invention will become apparent from with which the Wrapping must 'be iformed,

the following detail description, taken in conjunction with the accompanying drawing, wherein only a preferred embodiment of the invention is illustrated.

In the drawing:

Figure l is a perspective view of a molding boot embodying the present invention illustrated in assembled position in a gas main field joint;

Figure 2 is a vertical transverse section, taken along the lines 2-2 of Figure 1;

Figure 3 is a vertical longitudinal section taken along the lines 3-3 of Figure 2;

Figure 4 is an exploded elevation of the pair of end wall sections employed in assembling the instant molding boot; and

Figure is a perspective view of the wall sections shown in Figure 4.

The present invention comprises a molding boot for forming coatings of corrosion-resistant two end coating material about field joint couplings between gas main pipe sections. The boot is formed by assembling certain pro-formed sections of cardboard material or other sheet material consisting of a pair of end sections forming each end of the molding boot, and a side wall of sheet material wrapped around the end wall sections to completethe molding enclosure about the field joint coupling. The molding boot employs a novel arrangement of parts forming the end walls permitting the end walls to be assembled about the pipe sections and prevents seepage of the fluid coating material from the molding boot. While the molding boot of the present invention is specifically designed for use with field joints of the welded type or of the type commonly known in the trade as a dresser coupling joint, it may be used with other types of field joint couplings with equal facility. The specific embodiment described in detail herein and illustrated in the drawing has particular reference to a field joint of the type known as a dresser coupling joint.

The invention will be more clearly understood from the following description referring specifically to the accompanying drawing, wherein like reference characters designate corresponding parts throughout the several figures.

The molding boot of the present invention, indicated generally by reference character I0, is designed to be mounted upon gas main pipe sections II, II to completely envelop a field joint such as indicated by reference character I2 coupling the ends of the adjacent pipe sections to form a gas main. In the embodiment illustrated, the adjacent pipe sections II, II are joined at their ends by a coupling of the type known in the trades as a dresser coupling, indicated at l3, which generally comprises a plurality of flanged clamping plates embracing flanged ends of the pipe sections and secured together by longitudinal bolts.

The steel pipe sections I I, II of the type commonly used in the trade for such gas mains are provided with preformed coatings Id of corrosionresistant composition which extends substantially the length of the pipe sections and terminate, as indicated at It, at a point near each end of the pipe section, leaving exposed steel pipe surfaces I4". The function of the molding boot I8 is to form a receptacle in which a continuous coating of corrosion-resistant material can be molded.

about the dresser coupling I3 and exposed steel pipe surfaces I4 to form an interrupted extension of the preformed corrosion-resistant coating on the steel pipe sections.

A pair of end wall sections IS, IS, are adapted to be assembled together to form the end wall for each end of the molding boot It and are specifically designed in the preferred embodiment to be conveniently assembled about pipe sections of the larger diameter employed in commercial gas mains, such as those on the order of twelve to sixteen inches in diameter. The outer end wall section I5 is formed of two panels I1 and I8 stapled orotherwise secured together to form a laminated unit. The outer panel I! has an octagonal external periphery and is provided with a circular center opening I9 to accommodate the tubular pipe sections II, II. A radial cut H extends between one of the angles of the octagonal outer periphery 2c of the panel I1 and the center opening I9, and radial scores 22 extend from the two angles next adjacent the angle from which the cut 2| extends, to define access flaps 23 which may be spread apart at the out line 2I to permit the panel I I to be fitted onto the pipe sections II, II and seat the pipe sections in the opening I9.

The panel IS secured to the panel ii is of similar shape to the panel I'I, having a central circular opening 24, and scores 25 constitutin the sides of a regular octagon coextensive with that defined by the periphery 23 of the panel I'I. Securing tabs 25 extend outwardly from the score lines along six sides of the octagon and are adapted to be folded outwardly over the octagonal periphery 20 of the panel member I! to form a segment of an annular flange The panel is is cut away in the area between ends 21, 21 aligned with the scores 22 of the panel I'I, so that the end wall section I5 can be fitted over the steel pipe sections II, I I.

The inner end wall section IE is formed of two panel members 28 and 29, and is likewise adapted to be assembled on the pipe sections I I and II in face-to-iace contact with the end wall section 15. The inner panel member 28 of the end wall section It is formed with an external octagonal periphery 3B and a central circular opening 3| to accommodate the circular cross-section pipe II, II'. A portion of the annular panel 28 is cut away along radial lines extending from angles spaced two sides apart defining ends 32, 32 between which the pipe sections II, H may be admitted into the opening 3 i.

Secured to this panel member 28 by staples or other'suitable means is the panel member 29, which is coextensive with and complementary to the discontinuous section of the octagonal panel I8 defined between the ends 21, 21'. This panel member 29 is provided with two securing tabs 33 hinged to the body of the panel 29 along scores 34 conforming to two sides of the octagon.

If desired to afiord additional security against seepage at the central opening in the end wall sections I5, I6, an annular sealing ring, as indicated generally at 35, may be provided, which is provided with a circular series of orange peel sectors 36 bounding a central aperture therein and connected along a circular score line 31' to the body of the annular ring 35, permitting the orange peel sectors 35 to be bent outwardly and extended through the central apertures in the panels forming the end wall sections I5, I6 to overlie the surface of the pipe sections II, I! and seal the opening against seepage.

Each end wall of the molding boot IIJ may be formed by assembling the sections I5, I6 onto the pipe II, II until the pipe is seated in the central circular openings formed in the end wall sections, and drawing the sections I5, I6 together until 5 panel is is tited into the memosbetween the. ends 14- o the nasal. l.

"the secur abs it and as. o... panels t8 and 259. th n. beat outward riromthe dresser coupling i int to ie eslnaralls with-ax s. of; he-nine sec ons in. H; I and d fies a. oontinu u nse extending:- aroun t cash. and wa t, about. whioh; a continu us sheet. -oard.- b ard or like material is. to: he; idendam. oe cured to form. the sidewallo oi'theboots Elie side wall 4.. is pr ferably'iormed o a sineleshoet of cardboard mater aL, which is, scored; verselx as ndicated at 4.4 to permit theside w 40. to conform to the. octagonal: periphe y of; the

end walls. securin t.ai. .s.--4.lv are termed-attach.

end of. th panel orming the sidewall 411.1 b stapled or otherwise secured; together and com. plete't e enclosure.

The. end wa s. are to e so sowedfrom eaoh oth r relat ve to the transre se v dimensionsoi the panel forming the side Wallv .0. so; .at edges f. the sidev wall iorm ns; panel ma o h n e-form ngta s 26 and. 3. no. stapler r. other secur ng t ol to be. fitte t er the overly ends of the se urin tabs and, sid

walls-forming panel to staple, or other-Wise secure these elements together. Preferably anelongated slot 43 is formed n. a sectio oi. the ide. walk iormin panellying tween two adiaoei t 9. 7 41,. this section toform the upwardly facing side wall section when he mold n oot is assembl d, sov that the molten corrosion-resistantmaterial can be. poured into the molding boot through the openi Wh l ut one. part u ar embodim nt of; the n en on has been pa icularly hown nd described, it is distinctly understood t t m vention is not limited thereto but that various modi ations. may be madei-n the invention with? out ep r ng from thev spirit and QPQ- thereoi, and it s d ed, therefore, that onl such limita: tions. shall be. placed thereon. asv a e imposed. by the prior artand are. set forth; inv the. appended cla ms...

What is claimed is:

1. In a molding boot of sheet material. adapted to form an envelope about a pipe field joint for mold ng corrosion-resistant coatings thereon and having a tu ul rside w ll oi sheet mat rial co axiallydispo ed bou the field. joint. end walls l in the s of h ubula sidewal oi said looot, said end walls. each oomprislngoutoi' and inne en wall sectio the outer end wall sec= tion having a first annular panel. having ahinged e r forming an pen ng for a mittin a pipe in the central aperture therein and a second an: nular panel superposed thereon and conforming in shape to said first panel, said second panel having a discontinuous portion compl mentary ioroiedeasaitlseo r nseemplete surround n s -;o o osion-isistantooa n g zatshular s dewall oi shee m terial odaxially diseased about the field. lo end, walls a; i K .siv i and ou er.

ajdisoon 11.,- 15

tow s ng. n asinale. plane. aonditio t. s cu in abs. t eompiementary to the e t oomph oz. or said fir t anels andfolded at sl t. an lesto said pan ls to. define ann darilan e t't ie arinliery ther on and. means se uring. sai it ar ide. wal o1v she t. material a on ile at ra. eds s oi to. the annularii ises. formed; by s seeming. tabs to f in semis ...1l sur ounding said lle sii Jo a mold ng boot. 2... eetzna i eliadastesi to form an envelope about a pipe field'joi nt fig; mo d ng QQXQi9I ..-Ii. l2%n-t. toe. stilettos a hav ng. a tubular ide Wal of P. on li tre s: sost oo. o shee oaterialcoaxi llr Q nosed. about the field i d wall closing tonds. o ti wal oi said hoot. sa d end. wallseeen compris g. ou er a d. i ner endwa l. se ti. he. outer nd. wall: e tio hav ng a. .first. panel t e'iorm. oi; ext rnally eolysonal nu us having hinged seotorlornioe as one admitt ng am s n th to and. a ned with said hinssdseet. defi a recess, and said inner endwall see. n having a first annular panel coextensive with said second outer wall panel and a discontinuous portion for admission of a pipe to seat in the oentralopening therein and a second panel coextensive with and complementary to the discontinuous portion of said second outer wall panel and superposed on said first inner wall panel, said second panels being disposed in nested relation lying in a single plane when said boot is in assembled condition, securing tabs hinged along score lines complementary to the external periphery oi said first panels and folded at right angles to said panels to define an annular flange at thefperlphery thereof, and means securing said tubular side wall of sheet material to the annular flanges Risme tani to a .ned wan-said hing cl seat 1- dam-e a e m said inne endwall sostion, D l-is a first panel n th fo nioi an. ext rnally polygonal. a l d. I Walt pan i i oil a.

.n at s id $5 9 on aid fi s seine. isses ionisin n a sin le misled condition 1 god aio pseore lines... samples he. ext rnal oerinheraor said first meal and ioldedat right an les t amo to define a annular polygonal flange at the oeri lis r there n and means. seeming said .tubua lar side wall of sheet materialize the annularflanges formed by said securing tabs to form an enclosure completely surrounding said field joint. 4. In a molding boot of sheet material adapted to form an envelope about a pipe field joint for molding corrosion-resistant coatings thereon and 7 having a side wall formed of an octagonal tube of sheet material coaxially disposed about the field joint, end walls closing the ends of the tubular side wall of saidboot, said end walls each comprising outer and inner end wall sections, the outer end wall section having a first panel in the form of an externally octagonal annulus having a pair of flaps bounding a radial cut through said annulus and hinged along radial scores extend ing from angles of said octagonal annulus forming a hinged sector for admitting a pipe in the central aperture therein and a second annular panel superposed thereon and conforming in shape to said first panel, said second panel having a discontinuous portion complementary to and aligned with said hinged sector to define a recess, and said inner end wall section having a first panel in the form of an externally octagonal annulus coextensive with said second outer wall panel and a discontinuous portion coextensive with said hinged sector for admission of a pipe to seat in the central opening therein and a second panel coextensive with and com lementary to the discontinuous portion of said second outer wall panel and superposed on said first inner wall panel, said second panels being disposed in nested relation lying in a singleplane when said boot isin assembled condition, securing tabs hinged along score lines complementary to the sides of the external .octagonal periphery of said first panels and folded at right angles to said panels to define an annular octagonal flange at the periphery. thereof, means securing said tubular side wall of sheet material to the annular flanges formed by said securing tabs to form an enclosure completely surrounding said field joint and said tubular side wall having an opening therein for admission of molten corrosion-resistant material into said enclosure.

5. In a. molding boot of sheet material ada ted to. form an envelope about a pipe field joint for molding corrosion-resistant coatings thereon and having a side wall formed of an octagonal tube of sheet material coaxially disposed about the field joint, end walls closing the ends of the tubular side wall of said boot, said end walls each comprising outer and inner end wall sections, the outer end wall, section having a first panel in the form of an externally octagonal annulus having a pair of flaps bounding a radial cut through said annulus and hinged along radial scores extending from angles of said octagonal annulus form: ing a hinged sector for admitting a pipe in the central aperture therein and a second annular panel superposed thereon and conforming in shape to said first panel, said second panel having'a discontinuous portion-complementary to and aligned with said hinged sector to define a recess,' and said inner end wall section havingfa first panel inflthe form of an externally octagonal annulus coextensive with said second outer wall panel and a discontinuous portion coextensive with said hinged sector for admission of a pipe to seat -in the central opening therein and a second panel coextensive with and complementary to the discontinuous portion of said second outer wall panel and superposed on said first inner wall panel, said second inner wall panel being interfitted in the discontinuous portion of said second outer wall panel to complete an externally octagonal annulus therewith, securing tabs hinged along score lines complementary to the sides of the external octagonal periphery of said first panels and folded at right angles to said panels to define an annular octagonal flange at the periphery thereof, means securing said tubular side wall of sheet material to the annular flanges formed by said securing tabs to form an enclosure completely surrounding said field joint and said tubular side wall having an opening therein for admission of molten corrosion-resistant material into said enclosure.

6. In a molding boot of sheet material adapted to form an envelope about a pipe field joint for molding corrosion-resistant coatings thereon and having a side wall formed of an octagonal tube of sheet material coaxially disposed about the field joint, end walls closing the ends of the tubular side wall of said boot, said end walls each comprising outer and inner end wall sections, the outer end wall section having a first panel in the form of an externally octagonal annulus having a pair of fiaps bounding a radial cut through said annulus and hinged along radial scores extending from angles of said octagonal annulus forming a hinged sector for admitting a pipe in the central aperture therein and a second annular panel superpos'ed thereon and conforming in shape to said first panel, said second panel having a discontinuous portion complementary to and aligned with said hinged sector to define a recess, and said inner end wall section having a first panel in the form of an externally octagonal annulus coextensive with said second outer wall panel and a discontinuous portion coextensive with said hinged sector for admission of a pipe to seat in the central opening therein and a second panel coextensive with and complementary to the discontinuous portion of said second outer wall panel and superposed on said first inner wall panel, said second inner wall panel being interfitted in the discontinuous portion of said second outer wall panel to complete an externally octagonal annulus therewith, securing tabs hinged along score lines complementary to the sides of the external octagonal periphery of said first panels and folded at right angles to said panels to define an annular octagonal flange at the periphery thereof, said tubular side wall being disposed in surrounding relation to said end walls with the lateral edges thereof overlying and secured to the annular flanges at the external periphery of said end walls formed by said securing tabs, and said tubular side wall having an opening therein for admission of molten corrosion-resistant material into said enclosure.

GEO. P. KILLIAN. JAMES A. KILIAN.

Referenbe's Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,462,077 Weston July 17, 1923 1,512,660 Wright et a1 Oct. 21, 1924 1,867,476 Rogers July 12, 1932 1,947,413 Hay Feb. 13, 1934 2,055,885 Weston Sept. 29, 1936 2,127,694 Miller Aug. 23, 1938 2,308,793 Upton Jan. 19, 1943 

